DS3172 datasheet(78/232 Pages) DALLAS

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10.6 DS3/E3 Framer / Formatter

10.6.1 General Description

The Receive DS3/E3 Framer receives a unipolar DS3/E3 signal, determines frame alignment and extracts the

DS3/E3 overhead in the receive direction. The Transmit DS3/E3 Formatter receives a DS3/E3 payload, generates

framing, inserts DS3/E3 overhead, and outputs a unipolar DS3/E3 signal in the transmit direction.

The Receive DS3/E3 Framer receives a DS3/E3 signal from the Receive LIU or RDATn (or RPOSn and RNEGn),

determines the frame alignment, extracts the DS3/E3 overhead, and outputs the payload with frame and overhead

The Transmit DS3/E3 Formatter receives a DS3/E3 payload on TSERn, generates a DS3/E3 frame, optionally

inserts DS3/E3 overhead, and transmits the DS3/E3 signal.

Refer to Figure 10-13 for the location of the DS3/E3 Framer/Formatter blocks in the DS3174, 3, 2, 1 devices.

Figure 10-13. Framer Detailed Block Diagram

DS3/E3

Transmit

LIU

IEEE P1149.1

JTAG Test

Access Port

Microprocessor

Interface

HDLC

FEAC

DS3 / E3

Transmit

Formatter

DS3 / E3

Receive

Framer

Trail

Trace

Buffer

DS3/E3

Receive

LIU

TAIS

TUA1

Clock Rate

Adapter

TX BERT

RX BERT

UA1

GEN

B3ZS/

HDB3

Encoder

B3ZS/

HDB3

Decoder

10.6.2 Features

10.6.2.1 Transmit Formatter

Programmable DS3 or E3 formatter – Accepts a DS3 (M23 or C-bit) or E3 (G.751 or G.832) signal and

performs DS3/E3 overhead generation.

Arbitrary framing format support – Generates a signal with an arbitrary framing format. The line

overhead/stuff periods are added into the data stream using an overhead mask signal.

Generates alarms and errors – DS3 alarm conditions (AIS, RDI, and Idle) and errors (framing, parity, and

FEBE), or E3 alarm conditions (AIS and RDI/RAI) and errors (framing, parity, and REI) can be inserted into the

outgoing data stream.

Externally controlled serial DS3/E3 overhead insertion port – Can insert all DS3 or E3 overhead via a

serial interface. DS3/E3 overhead insertion is fully controlled via the serial overhead interface.

HDLC overhead insertion – An HDLC channel can be inserted into the DS3 or E3 data stream.

FEAC insertion – A FEAC channel can be inserted into the DS3 or E3 data stream.

Trail Trace insertion – Inputs and inserts the G.832 E3 TR byte.

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